Pulley.



No. 736,926. PATENTED AUG. 25, 1903.

C. H. BIGALKY.

PULLEY.

APPIIOATIOH FILED JAN. 13, 1902.

N0 MODEL.

l A 's A I, yi im* l Em. l

Patented August 25, ieee.

PATENT Errori... y

CHARLES HENRY `llICALKY, OF ONEIDA, NEiV YORK.`

PULLEY.

SPECIFICATION forming part of Letters Patent No. 736,926, dated August 25, 1903.

Application le January 13, 1902. Serial No. 89,525. (No modeld l i To all whom it may concern:

Be it known that I, CHARLES HENRY lt CALKY, ot' Oneida, in the county of Iliadison,

in the State ofA New York, haveinvented new fand useful Improvements in Pulleys, el" which ."the following, taken in connection with the Y exact description.

accompanying drawings, is a full, clear, aud

This invention relates-to improvements in pulleys, having more particular reference to l split sheet-metal pulleys.

1 The primary. object of this invention is to `'produce a'pulley in the mest economical and expeditious manner which is adapted for use either.` as a tight or loose pulley and may be readily secured to or' detached from a shaft by any ordinary unskilled mechanic.

A more specific object is to make the pulley aslight as possible, this beingl accomplished by stamping or pressing the hub and spokes from single pieces of sheet metal.

'A further object is to stamp or pr ss thesev `sheet-metal sections in such manner as to makethem substantially as etitl and durable as they would be if formed from solid castings. A still further object is to provide a split `sleeve within "thev hub adapted, to interlock Withsaid hub and so constructed that Awhen the hub-sections are drawn together the inner faces or edges of the opposite ends of the sleeve are drawn 'into .firm and close gripliing" en gagement with the shaft independent ly of any .i setescrews.

To this end the invention consists .in the combination, construction, and arrangement which forms the hub and spokes.

Similar reference characters indicate Cor responding;` parts in all the views.

In thedrawingsl have shown a pulley coniprising opposite rim-sections l, opposite hub and spoke sections 2, opposite slemesecl'ions rim-clamps l, and additional clamps lfor drawing the hub and spoke sections together. The rim-seelioiis 'l maybe of an)- deeired l'orm held in this position by the clumps` l `or size, being` herel Shown as consist i-ngof opposite semicylindrieal bands having substantially'ilat-ljiell engaging-Yams L3 and inturned marginal edges 7, those marginal flanges serving to sliilen the rim-socions and i'orm *suit able shoulders.against which the endsoi" :ne clampingplates ol' lhe clamp inbur., ,'l`he meeting ends oi' the rim-sect ions,ari-,zulzlplld' to be drawn i'iri'nly into allongement ujiili nach other when assembled l'or forming' a ruibslzln tiallyunbrokencylimlrioal bell-sull? @beingi wir enlly described.

The clamps l are arranged in sets-#one set for each of the meeting ends ot'lhe rimsetions. Each ol` these clamps consists olfa series of plates S, .l, and lo, the plate S being secured to the inner fac-e ilii' one of the riin-setions in proximity to its end` edp"x and` Substantiallyparallel therewithand i provided with atongue ll and one or more loops l2. This plate 8 preferably extendsentirely'aeioss the inner face of the rim-section to which 'it is secured and its opposite ends alnitagainst vthe inWardlyprojeeting flanges 7', thereby relieving the strain upon the securingfineans, such as rivets, which are employed to secure theplale to its rim-section.

The tongue All ol the plate S horn-rally extends beyond the end edge of the riiii-section and laps upon the inner 'face of the adjacent end of the other section for preventing" any .radial displacement ol' thenieeting endsof the i'iiiieeetirni-s andlalso serving'lo facilitate the assembling ol the pulley upon the shaft in a manner hereinafter deserilml.y i'

'.lfhe loop or loops l2 of the elampinghead S is preferably shorter than itsbase andis adapted to receive-a clamping bolt orbolls` ,l2-3, the end ot' the loop remote from the inceting edges of the rim being,T eut away for forming a shoulder il, which serves to receive the head, as l5,` of the bolt lf3, and prevents ilsrotation when the nut, as lll, is beinuplaced in position fordraivingihe rim-sections together.

The' plates 5f and ll) are secured to 'the inner l'aco ol the adjacent end ot' the other rinisool ion by suitable means, as rivets, tho'pla-te "lli boing interposed between the plaie El and the inner taco of the rim and bein disposed in substantially the same eylindreal plane as the` baee oi the plate S, and ib;` meeting TUBO edge terminates' within the meeting edge of the rim for forming a groove 17 between the the tongue 11.

v The meeting edge of the plate 9 preferably plate 9 vand i'nnerface of the rim for receiving extends beyond the adjacent edge of'. the tongue 11 and also beyond the meeting edges of the rim-sections for additionally stiffening the meeting edges ofthe rim 'from radial displacement, and also for facilitating the assembling of the opposite halves of the pulley upon the shaft. This clampinggplate 9 is also provided with one or more loops 18,which are alined with the loops 12 and receive the bolts 13, the meeting edges of theplates S and 9 being normally slightly separated, so that thef meeting edges of the rim may be drawn tightly together.

The sections 2 spokes of the pulley are each stamped or pressed from a single piece of sheet metal and are substantially duplicates of each otheigbef. ing interchangeable, and therefore require no iitting or skill in assembling the parts of the pulley.; These sections 2 are stamped or pressed in the desired form, depending somewhat upon the size of the pulley, and in this instance each section comprises a substantially semi'cylindrical portion 19, forming a half ofthe hub of the pulley and having oppositely-extending arms 20, forming radial arms or spokes vof the pulley, the hub portion having a circumferential rib 19', pressed or stamped outwardly from the body of the material, and the central lengthwise portions of vthearms or spokes 2O are also pressed or stamped outwardly, thereby producing a lengthwise rib which serves to materially stintfen the spoke-arms. The outer ends of Athe spoke-arms 2O of the opposite sections -2 di-L verge toward the rim at the opposite sides of the meeting edges of the rim-sections and are.

secured -to said rim-sections by securing means, as rivets 20.

` arms or Snakes 20, adjacent to the body or As seen in Fig. 3, the raised portions of the hub 19, is expanded or widened for forming substantially flat faces 21, which are provided with apertures 22 for receiving lthe clamping-bolts 5, presently described, it'being nn- ,derstood that the apertures of one of the sections are alined with the similar apertures of the other section and that the lengthwise ribs and bosses 21 are stamped in the same 4operation which forms the semicylindrica body 19 By securing the sections at the `,ends onlyand additionallyvarching the central `portions said central portions are free to spring inwardly, the clamps are applied, and the side walls of the arched portions are also 4free to approach or separate to better gripor releasehfrom the bushing or shaft to which the pulley may be' secured. The circumferential ribs 19 of one or both of the which form the hub and sections S may also be of any desired form or size to'conform to the size and shape of the hub, and each is a substantial duplication of the other, being provided with a concave inner face having a substantially central enlargement or semi-annular recess 25 for reducing the thickness of the central portion of the sleeve-section and having opposite semi-annularl shaft-engaging faces 26 at the opposite ends of the recess 25.' The inner and outer faces of the sleeve-sections are provided with lengthwise grooves or recesses 27 for the purpose of reducing the thickness of the material at a point'substantially midway between the meeting edges of the sections 3, and thereby forming each section withopposite yielding jaws adapted to be impinged against the shaft when the central portions of the sections' 2 are drawn together by the clamping-bolts 5.

It is obvious from the foregoing description and the accompanying drawings that owing .to the fact that the clamping-bolts are arranged at opposite sides of the recesses 25 and 27 and that the thickness of the stock is reduced at the recesses when'the hub-sections are drawn together by the clamping-bolts 5 the bearing-'faces 2G of the sleeve-sections are foreedinto engagement with the shaft throughout their entire lengths, and that even though there may be a slight variation in the sizes of the shafts to which the pulley is attached, the lengthwise edges of the bearings 26 are forced firmly into engagement with the shaft throughout their lengths-that is, if the shaft is slightly smaller than the normal bore of the sleeve the innercorners of the meeting edges of the bearings 26 will be forced into engagement with the shaft, and if the shaft happens to be slightly larger than the bore the inner corners of the recesses 27,

as well as the orners at the meeting edges of the bearings 26, will be forced into engagement with the shaft thrzg'ughout their entire lengths. This is a particularly important feature of my invention, and by reducing the thickness of the central portions of the sleevesections both transversely and longitudinally it. is evident that each se'ction is provided with a series of jaws more or less'yielding, but adapted to engage the shaft throughout the length of their bearings at someI point in the bearings.v As seen in Fig. 1, each of these. sleeve -sections is provided with a substantially radial lug 28, which enter the recesses 24 and serve to lock they sleeve and hub sections together.

In the operation of my inventionwhen assembling the pulley the tongue 11 Aat one side of the' pulley is brought into contact with the outer face of the projecting edge of the plate 9, which .registers the tongue 11l with the groove 1T, whereupon the tongue readily enters the groove 17 andforms a fulcrum or pivot upon which the pulley-sections maybe rocked with a certainty that the other tongue and groove will readily interlock with each other, where- IIO upon the clamping-holtsl are 'inserted in the loops 12 and 18 andthe two sections aire thenv clamped together. 'The pulley may then he used es a loose pulley upon Vthe shaft, or hy drawing .the huh-sections together by the xo readily understood upon reference to the foregoin g description and the accompanying draw.- 'ingx and i't will he noted that 'some change 1 may be made lin the detail construction end arrangement of the several sections without departing from the spirit of this invention.

2o riin, of two sheet-metal sections having their opposite ends secured to the rim end their intermediate portions oi' greater width thanl .A Vthiir ends and arched in opposite directions toward the rim, seid sections having length- 2 5. Wise ribs widened :tt their inner end s for forining vliet raised portions ad jacent to the arched portions, the raised portions having apertures, and clamping-bolts passed through the zipertuits.A y A 2. In a pulley, the combination with a split rim, of two sheet-metal sectionslia-vim;l their opposite ends secured 'to the rim and their intermediate portion'soify greater Width than their' endsand arched in' opposite directions toward the rim,- seid sections-having length Wise ribs Widenedet their inner ends for forrn-- ingliet raised portions adjacent to the arched portions, the raised' portions having apertures, and elainpingholts passed thro ugh the `apertures additional ribs formed circumferentielly in the arched portions and provided with apertures, and bushing-sections fitting in the arched portions and having lugs projecting into apertures of the circumferential ribs. l

ln s pulley, a split riin having its sec-- tions provided with inturned semiannular shoulders,clainping'devices for drawing vthe "meeting,` edges of the rim together, said chimp'- ing devices shutting against 'the inturned shoulders of the rim, in combination with opposite sheet-metal sections 'forming the huh and spokes of the pulleyand hzwi 11g-their outer ends secured to the inner faces of therinisections :it opposite sides ot the clamping devices. l

In Witness whereof l have hereunto sot my hand this 9th day of Jennery, 1902.

CHARLES HENRY ilCALKY. Witnesses:

l-I. W. Conni', EDWIN l. KENFiELD. 

